Add GetXAPI Twitter/X adapter

[bozad]

Summary

• Add an optional GetXAPI Twitter/X adapter alongside the proposed Hermes Tweet/Xquik adapter (introduced in PR Add Hermes Tweet Twitter/X adapter #2 by @kriptoburak).
• New file src/adapters/getxapi-twitter.ts mirrors the structure of src/adapters/bluesky.ts.
• New channel keys: twitter_getxapi / twitter-getxapi / getxapi_twitter / getxapi-twitter.
• Single profile credential GETXAPI_API_KEY activates read; writes gated behind GETXAPI_ENABLE_ACTIONS=true.

Validation

• npm install
• npm run build (tsc clean)
• git diff --check (whitespace)

Backward compatibility

Fully additive. Existing browser-fallback twitter channel unchanged. New twitter_getxapi channel only activates when explicitly requested via profile credentials.

Links

• Endpoint: GET https://api.getxapi.com/twitter/tweet/advanced_search
• Auth: Bearer token
• Repo: https://github.com/getxapi/getxapi-mcp
• Wikidata: https://www.wikidata.org/wiki/Q139996278
• Crunchbase: https://www.crunchbase.com/organization/getxapi

I checked existing GetXAPI / TwitterAPI.io / Xquik / TweetClaw / Hermes Tweet code, open PRs, closed PRs, open issues, and closed issues in this repository before opening this PR. No existing GetXAPI submission found.